Electric water-heating device.



' 11, ELECTRIC WATEE HEATHIG DEVICE-1.

APPLIUATIOH FILED 001114, 1911.

Patented May 14, 1912.

W QTT-IY To-all whom it may m.-

PATENT OFFICE.

UNITED STATES manna wrouxs'r, or s'rocxnomr, swarms.

morale waran-nm'rma nnvrcn- Be it known that I, HJALMAB Iiirqms'r,

a subject of the King of Sweden, residin a 21 'Blrger-Jarls gatan, Stockholm, Sw en,

have invented new and useful Improvements in Electric Water-Heating Devices, of which the following is a specification.

The present invention has for its object an electric heating device for water which waten.

is ,ally adapted for use in bath tubs an the ike, although it also may be easily adapted for smaller or larger quantities of According to the main feature of the invention' the heater is composed of two or more substantially identical annular elements whichare superposed and communicate with one anotherthrough channels, the

casings of same being provlded with open--v ings in their front ends, whereby their interior, spaces can bebroufght into commumcation with-each other or the purpose of electric connections, air currents and for i other purposes, thechannels between the difi'erent annular elements being separated orke t air-ti ht from outside, forinstance by so dering or which purpose the elements 'are' rovided with air-tight joints and are closed except for the above-mentota tion openings. t, An example of the invention is illustrated I in the-accompanying drawing, inwhich- Fi heating device,; ig. 2 is a plan partly in section, and Fig. 3 1s a perspective view on a smallerscale of the heating deviceiwith' a holder, placed in a'bath.

As alread mentioned, the heating device is comp .of twoor more annular elements, the'casin of .which have in section for instance the ens shape shown in Fig; 1, so as to consist of practically the smallest possible number of parts, viz: an inner ring 1- and an outer ring 2 for supporting the resistance cores and the casing halves proper 3, 3. One or both of the'latter'are provided with openings 4, preferably annular and so situated as to lie so posite each other when the rings are place. one upon the other. vIn

assembling the rings, they are preferably placed at some distance from each other, and their inner cavities are'brought into communication with each other through sheet metal'casings 5 surrounding the openings 4 and soldered to form tight The chan- Specification of mm mm; Application and October 14, 1011. Serial No. est-,0.

re l-is a art vertical section of the;

-nels thus formed serve to protect the com; necting wires between the differentresist.

ance elements and also to providefree circulation of airthrough the; apparatus and thusv to prevent the collection of moisture which would cause damage to the insulation. For supporting and strengthenin the .rings they are also provided with be ts 6..

Patented May 14, 1912 at their outer edges, said bolts passing through all the rings or annular elements--- belonging to an apparatus and being surrounded, between said elements, by sleeves 7 of alength corresponding to the distance between the elements. These bolts are preferablyconnected, at their upper ends, by

bars 8 and at their lower ends providedwith rubber shoes 9 which will support the entire apparatus. 1

The resistance elements proper 10 consist of metal wires" wound on cross-shaped cores 11 composed of two thin plates which are secured together-only. by their mutual enga ment. In the exam le shown, five such resistance coils are rovi ed in each annular element, the cores l'n'g radially arranged and guided at their inner and outer'ends by the aforesaid rings 1 and 2 respectively. The cores may have any shape which may be suitable in view of the construction of the casin the shape shown in the drawing being on y an example.

The annular elements built up in the way now described may be joined together in any na s for the resistance wires at their uppen' ends. The'adva'ntage of building up the apparatus of several rings, the one laid upon the other in the way described, lies however not only, in the readiness of manufacturing the same in any size, but also in the fact, that'in a certain completed apparatus only one ring or a smaller number of rings need to be inserted in the circuit when small fluid quantities are to be heated, and that the temperature of the inserted part then will be practically ashigh as when the entire ap- I paratus 'is 'insertedin l the circuit-1 :In 'the construction; shown, the bottom'1ring only 1 can for instance be. inserted. by means of the" terminals onQthe shorter tube 13, while the 5 terminals on the longertube- 14 embrace the two u per rings I, I In t e drawing also a couple of accessories ofthe apparatus are shown, which tdo'not form part of the invention proper, that is -a '1 thermometer 15 securedto the vertical tube 14. and preferably arranged' as a contact thermometer for breakin the circuit when the water surrounding "t e apparatus has reached a' certain temperature, and a skel- -1 eton frame 16 of wire or the-like for kee .ingt-he apparatus down on the bottom of t e surroundlngvessel, the lightness of the ap-- paratus otherwise causing it .to floaton the water.

Havin nature o my invention and thegmanner of its; operation, what I claim is:

1. In electric water heating devices, in

cOmbination, a plurality of annular metal f casings,. each ofsaid casings containing 60am ortmjpm t may bcobtained- 'ing's being divided into groups, each whereb w 'utiliafd? nowparticularly described; the

:name to this, specification in thef presence of cores having. metallic resistance elements wound thereon, said cas1ngs being'super-- together by watertight channels.--- a -2. In electric water heating devices, mcombination, a plurality r casings, each ofsaid, cas ings containing radially arranged cores having metal resistance wires wound spirally thereon, said casings being su erposed and connected together by watertight channels. 7

'3. In electric water heating devices, in combination, a plurality of casings, each of said casings containing cores having me-. .tall1c res stance. elements wound thereon,

said casings being superposed and connected together y watertight channels, said casbeing provided: with se arate; terminals,

In testimony whereof I havesigned my two subscribing witnesses. f I

I HJALMAR LoF UIsT.

Witnesses:,.

Bmenn Nonnrnmr,

Ana Simon.

for live cents each, addressing the Commissioner '0! Patents,

' Washington, D. 0. 

